Influence of Inoculum Concentration on Infection of Red Pine Seedlings byGremmeniella abietina

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Abstract
Inoculation of Pinus resinosa seedlings with a graded series of inocula of the North American race of G. abietina revealed that 2.5 .times. 108 conidia/m2 of transplant-bed area were required to kill 50% of the seedlings. In general, the capacity of the pathogen to colonize an artificial medium was reduced after a single passage through the host, although 2% of the isolates recovered from the host showed enhanced growth.

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